| Project/Area Number |
09480100
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
エネルギー学一般・原子力学
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| Research Institution | KYOTO UNIVERSITY |
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Principal Investigator |
MORIYAMA Hirotake Kyoto Univ., Research Reactor Institute, Prof., 原子炉実験所, 教授 (90127150)
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| Co-Investigator(Kenkyū-buntansha) |
KAWAMOTO Keizo Kyoto Univ., Research Reactor Institute, Instructor, 原子炉実験所, 助手 (70089134)
YAMANA Hajimu Kyoto Univ., Research Reactor Institute, Asso. Prof., 原子炉実験所, 助教授 (30283683)
西川 佐太郎 京都大学, 原子炉実験所, 助手 (60027430)
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| Project Period (FY) |
1997 – 1999
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| Project Status |
Completed (Fiscal Year 1999)
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| Budget Amount *help |
¥11,700,000 (Direct Cost: ¥11,700,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1998: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1997: ¥9,500,000 (Direct Cost: ¥9,500,000)
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| Keywords | high level radioactive waste / geologic disposal / transuranium elements / solubility / hydrolysis / adsorption / 炭酸錯体 |
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| Research Abstract |
In order to know underground migration of transuranium elements (TRU) which is important for the safety assessment of geologic disposal of high level radioactive wastes, their adsorption behavior onto rocks and hydrolysis reactions were investigated in the present study.
(1) For the adsorption behavior of radionuclides onto rocks, experiments were performed with some adsorbates(CsィイD1+ィエD1, SrィイD12+ィエD1, BaィイD12+ィエD1, EnィイD13+ィエD1, AmィイD13+ィエD1, etc. )and typical adsorbents (quartz, rganite, etc. )to study the applicability of the electric double layer model to adsorption reactions of TRU. The measured data were well analyzed by the model and the obtained thermodynamic equilibrium constants were discussed from a systematic point of view for predicting the unknown values.
(2)For the improvement of thermodynamic data on hydrolysis and complexation of actinide ions, the solubility measurement and the time-resolved laser induced fluorescence measurement were performed of U(VI) in alkaline solutions, and the hydrolysis constant for UoィイD22ィエD2(OH)ィイD32-(/) 4ィエD3was newly determined, and the coordination properties of U(VI) hydrolysis species were discussed.
(3)Furthermore, the hydrolysis constants of actinide ions were analyzed by using an improved hard sphere model in which the effective charges of actinide ions were considered. In addition to ordinary electrostatic interactions, non-electrostatic interactions were found to contribute to the stability of the hydrolysis species of these ions.
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